minor: create filenames not supported by Windows

[steveseguin]

The returned datetime was not supported by Windows. I replaced the line with folder_name = "\\{0}_{1}_{2}_{3}_{4}_{5}_autoencoder".format(int(time.time()), z_dim, learning_rate, batch_size, n_epochs, beta1) as well as just changing the import from datetime to time.

https://github.com/Naresh1318/Adversarial_Autoencoder/blob/0635b1e173b642245be611de5880b38abb88f22a/autoencoder.py#L63